h1{
    margin: 0px 0px 25px 25px; /*上右下左*/
    padding-top: 10px;
}
.main{
    margin: 0 auto;
    background-color: #cccccc;
    width: 550;
    height: 400;
    box-shadow:1px 1px 3px #999999;
    border-radius: 10px;
}
.selectStyle{
    
    margin: 0px 0px 0px 150px; /*上右下左*/
    
}